# Shared Flashcard Set

## Details

CartographyCH7
UNA Dr. Strong Cartography 325
12
Geography
04/20/2010

## Additional Geography Flashcards

Term
 Apparent Density
Definition
 the subjective response to the physical stimulu of the actual density of the objects in a visual field
Term
 Center of Gravity Principle
Definition
 Placement of the dot in its territorial domain in the way that best represents all the individual elements in the domain.
Term
 Coalescence
Definition
 merging of the dots in dense areas; the visual integrity of individual dots is lost
Term
 Dot Density Mapping
Definition
 method of producing a map whose purpose is to communicate the spatial variability of density of discrete geographic data; also simply called dot mapping
Term
 Dot Polygon
Definition
 the area represented by each dot on a dot map, also referred to as the dot's territrial domain
Term
 Dot Value
Definition
 the numerical value represented by each dot in dot mapping, sometimes referred to as unit value
Term
 Locational Filter
Definition
 ancillary data layers or maps that influence the placement of dots within the enumeration units
Term
 Numerousness
Definition
 the subjective response to the physical stimulus of the actual number of objects in a visual field; not the result of the conscious ativity of counting; number is underestimated reading dot maps
Term
 Spatial Proxy
Definition
 the dot's function of representing geographical space
Term
 Mapping Technique
Definition
 1. use point symbols for quantitative data 2. Symbol form consider size, shape, color, and the frequency of dots 3. works best for enumeartion area totals, dot locations, ancillary data and dot locations
Term
 Advantages of dot density map
Definition
 1. easily understood 2. good way to display variations in spatial density 3. original data may be recovered from the map 4. more than one data set may be illustrated 5. GIS and mapping software implementation
Term
 Disadvantages of a dot density map
Definition
 1. reader perception is not linear 2. GIS will randomize dots within enumeration units 3. ancillary data layers or imagery doesn't control dot placement 4. large ranges in data values aren't acceptable 5. practically impossible to recover original data values when them map is designed for optimum portrayla of relative spatial density
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